The network Auditing System usually used to implement the user authentication, access control, log recording and other functions such as flow charge in a large network.

网络审计系统广泛应用于园区网络，实现园区网络内的身份认证、访问控制、日志记录以及流量计费等功能。

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For clients, they only need authenticate once, but they can access the whole network (union of helping charge). It's convenient because they don't need to memory a large of names and keywords.

对于用户，只认证一次，就可以全网(代收费联盟)访问，是非常方便的，无需再记忆大量的用户名和密码。

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